Rarity may refer to: Concepts Economic rarity, or scarcity, the economic problem of human want exceeding limited resources Species rarity, the position of species organisms being very uncommon or i
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4d69474658504465ff7c17a8965112995cd217d182b61e37a979dc1fb9a6df. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/652f0b67-5945-46b4-9037-beec2c52cde1.json and https://artists.proofprofile.net/proofs/artist/652f0b67-5945-46b4-9037-beec2c52cde1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab5aa81b96b6d66c15ba7e84cecfb4d80f2c11087a2d6bf530cbf01dc34ced5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USEK71527102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e54e1beefc37146a3fc2f909f95f962de6acf86a06190c1f8b2f43fe83e47b2. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USEK71527103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacb4af2f54ef62de2cb0477fcd6145d10c170be73fa2a047ca41c6e6f0af01a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USEK71527104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f732c8517ef78d8de027d566ecbf47ca60d1dca31458f95cf88d9111237618. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USEK71631701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362fd748e04e5d449cfdc4ea3e519da4ff284dd7d53846c3abfbda8f4799c48d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USEK71631702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f309c6f2e591d1456fffc158c23ac7f523032ababb315f399c62b1eed31f810. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USEK71631704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef26023d206e0f30cf2af405ab0e496aed270a4da49890087ff983331dc9cf0a. Chain 2 (Bitcoin): anchored in block 957629 (2026-07-11T23:44:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USEK71631705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27b76ddb58a7f1f308b070249e35f7431da78ed6d306c478c81480c0a8b00ab. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USEK71631706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdab764e14d40883afb50f9c6a3130a6b10f30b19d27d000edde4c7fceec010d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USEK71631708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fe5df58f6d3d6b80430f76d5565d06c36c2a238ae5d77feaa5a261b9a05494. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA02W1900075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66844406ca039de94cab2cc5b05cacd64cea2b0d7b31415dbe88a1f2f0c2d82e. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA02W1900076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f699e8d7e1c07d01ba9e394ce81856e372d82024538066affb72823f501bf2d. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA02W1900077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a671dc90904d3323d1a9159f2b700b910c68c2643be42c2ced54880db6f81bc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA02W1900078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8ba16dc1f71fa1b33f872b174dd0ae4ff6bb71d30bc88e6ce0058f368dc69f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA02W1900079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5941fdb40f8f34c4eb3c15f844aa1aade74c66b2a4ffc9ad7a4fdc0f1674f79a. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA02W1900080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96352c2f5f74d70a002f2dbf787a7ea3139625d510d46c17f858fc1e23281ea1. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA02W1900083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826e5675494bd95e33c969d23a27aad6d2c6be6c67ad1835fe7841054e70167f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CADE72001141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f756e58dd0d2ec2e083a1c423f74ad1fee7690b5f429f8f625066ab8b075c6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CADE72301773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f440b00f710bd177c851f56f4dfee78c62d6dac9456836c1e085849a32a7f67. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CADE72301772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48967accba74fec6220f47abbf57d47438ba983c7e4e03442ec0f42a37b2f166. Chain 2 (Bitcoin): anchored in block 957629 (2026-07-11T23:44:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CADE72301769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa2960bef6e40e7b22d7e37df89aeb29cc8bee61551ff87fa28f1d8058527f7. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CADE72301770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3dcc61d6994e2bc2cccc52286e6868b092daf620df247fc1f91e6c3759ed6a1. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CADE72301771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797768b817192bf855ff7e59062d2bb611cb75896fcdd982a22c5313faf2e3a5. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CADE72301774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f377f4e47c4ca87352077c8a3a57d25d64a8539908bd783fe2dc8bb3b7f5634. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CADE72301775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede83c1146ea2ff8819d59f661797588836e15e9c363bc2d7025832a36a05466. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CADE72301778.